linux-kernel - [PATCH 5 of 7] x86-64: don't check for map replacement

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Message-Id: <5c6de0fa4ee3a72a0ab5.1220826077@localhost>
Date:	Sun, 07 Sep 2008 15:21:17 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: [PATCH 5 of 7] x86-64: don't check for map replacement

The check prevents flags on mappings from being changed, which is not
desireable.  There's no need to check for replacing a mapping, and
x86-32 does not do this check.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/mm/init_64.c |    3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -195,9 +195,6 @@
 	}
 
 	pte = pte_offset_kernel(pmd, vaddr);
-	if (!pte_none(*pte) && pte_val(new_pte) &&
-	    pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask))
-		pte_ERROR(*pte);
 	set_pte(pte, new_pte);
 
 	/*


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